Malicious PDF — malware analysis report

Static analysis result for SHA-256 683b6d32952e3492…

MALICIOUS

PDF

62.7 KB Created: 2020-08-10 02:44:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: de34180d0f0f2499f567bdefe8332a6d SHA-1: 625bbf8ffdf9a9c99c9970a1e30cc3df390279aa SHA-256: 683b6d32952e3492ef68cece930e28ccafcc5dd1cf4bee69037e1f6c72a1f9cf
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a redirector service known to host malicious content. The document body, though obfuscated, contains a URL that also leads to this redirector. This suggests the primary purpose is to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.com/pify?keyword=toefl+test+preparation+books+pdf
    • http://files.singaporelawngames.co/uploads/1/3/1/4/131407148/kisekorezipisel_xarumezekete_taxazonusajis_jivogozajutixu.pdf
    • http://files.empactathletics.com/uploads/1/3/0/8/130874163/2093009.pdf
    • http://files.bostonbulldogsrunning.com/uploads/1/3/2/6/132681767/pajadopoganegad-rukamitajewu.pdf
    • http://files.ebonydeecheyne.com/uploads/1/3/1/1/131163669/2767288.pdf
    • http://files.loveaffairwiththyself.com/uploads/1/3/2/8/132813998/dixuf_xewirixu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/3484/4059/files/nasoweravowawoj.pdf
    • https://cdn.shopify.com/s/files/1/0435/7318/2625/files/7750896330.pdf
    • https://cdn.shopify.com/s/files/1/0440/6041/0021/files/vuvunejipodibefona.pdf
    • https://cdn.shopify.com/s/files/1/0433/0897/4235/files/77550271287.pdf
    • https://cdn.shopify.com/s/files/1/0429/7634/6266/files/23959209197.pdf
    • https://cdn.shopify.com/s/files/1/0427/9985/7823/files/popurimub.pdf
    • https://cdn.shopify.com/s/files/1/0431/8475/0743/files/tales_of_arabian_nights_book_of_tales.pdf
    • https://cdn.shopify.com/s/files/1/0432/8315/3056/files/monopalewozetudalakabip.pdf
    • https://cdn.shopify.com/s/files/1/0435/6957/8147/files/26216625211.pdf
    • https://cdn.shopify.com/s/files/1/0433/7857/3464/files/67266016961.pdf
    • https://cdn.shopify.com/s/files/1/0436/6984/8217/files/self_appraisal_sample.pdf
    • https://cdn.shopify.com/s/files/1/0440/2138/3333/files/cadena_de_coros_cristianos_de_avivamiento_letra_y_acordes.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000adc5.bin
d30caa166eee0653596dc9d262daed8cf1fdd0ad0a1ac298e7fce24c2de54251		 pdf-font-stream PDF embedded font (sfnt) at offset 0xADC5 5188 bytes
font_01_sfnt_off0000bf67.bin
6d2a3a16cc464ce72cf05976c7f96a31c93af2202e0dc760c37a694345e222ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBF67 1800 bytes
font_02_sfnt_off0000c7f7.bin
18470d2ca84f4a3b68c3d3f67783b988bbfd72daed40cea998ee467d6a46c212		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC7F7 10932 bytes

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